. >> it was 29-year-old krystle campbell. >> she was just a beautiful young girl. she reminded me of my daughter, actually. and her wounds were horrific. you know, we worked very hard on her for a while until it was clear that it was -- it wasn't going to help the situation at all. and at that point we were feeling for a pulse and then the cardiac rhythm on the monitor was such that she was not going to survive and at that point the physician, you know, pronounced her -- said she was dead. >> dead in his arms. >> we just kind of all -- we just let out this guttural scream, you know. but that was it for that moment because we had to go on to the next patient. >> for the next 45 minutes, steven worked triage on the front lines. dozens were rushed to the emergency room under code red, meaning their chances of survival uncertain. >> it's a horrific tragedy that, you know, you couldn't wish on anyone. >> trauma surgeon dr. david king crossed the finish line moments before the second explosion. as the bodies were rushed from the medical tent to the emergency room, dr. ki